GKAPTOLITES OF NEW YORK, PART 1 777 



Didymograptus incertus sp. nov. 



Page 700 



14 Single specimen observed 



Graptolite bed 7 of tlie Deep kill section 



Genus phyllograptus Hall 

 Phyllograptus ilicifolius Hall 



Page 706 



15 Specimen possessing the normal expression of tlie species. x2 



16 Broad rhabdosome. The thecae are less curving in the original than in the 



figure 

 17, 18 Two forms with different positions of the broadest portions of the 



rhabdosomes 

 19, 20 Very narrow forms 



21 Enlargement of the apertures of thecae. x5 



22 Young rhabdosome showing the sicula. x5 



The originals are from graptolite bed 2 of Deep kill section with 

 the exception of that of figure 18, which is from graptolite bed 3. 



Phyllograptus anna Hall 



Page 714 



23 Specimen with distinct sicular spine. The direction of the thecae on the 



left side has been incorrectly traced. 



24, 25 Rhabdosomes showing the prevailing broadly truncate outline of the 

 antisicular end. In figure 24 it is not quite correctly traced by the 

 lithographer. 



26 A relatively large and slender I'habdosome. The outline and the anti- 

 sicular end have been incorrectly traced. The original is narrower and 

 its margins less abruptly converging at the antisicular end. 

 Graptohte bed 5 of the Deep kill section 



